Boring tool



Feb. 25, 1930. J. 5. STEVENSON, JR

BORING TOOL Filed April l9, 1928 4 n m M N m m fll Wm w 4vb 5w QM 5 NQ Hy J Patented Feb. 25, 1930 i p V UNETZED ,STATES PATENT @FFEQE JOHN s sTEvnNso vJn, EAST cannon, new JEnsEY, assrsnon. re AMERICAN can AND FOUNDRY COMPANY, on NEW YORK, n. 51., a CORPORATION or new BORING TOOL Application filed. April 19, was. Serial No. 271,192.

, This invention relates to adjustable boring The stem dis provided with an aperture, ex- .tools such as are used in boring mills, turret tendinggtransversely therethrough, which is .lathes, drill presses ,or the like, for boring arranged to be alined with apertures formed metal. I i r v p in the member 8 whereby to receive a wedge One object of this invention is to provide key 10 for an obvious purpose.

atool having a pluralityiot sets of 'cutters The upper end of the stock A is provided arranged longitudinally of its length, atwith recesses in which locking dogs 12 are ranged inspaced relation and adapted to secured by suitable fasteners 14., said dogs out successively through apiece of metal. extending eyond the upper edge of said 10 Another object of the invention is to pro stock and into recesses 15 formed in the memvide an improved assemblage ofparts for a fber 8 and alined with the before-mentioned boring tool. is I recesses in the stock, whereby to restrain the A further object of the invention is the stock against relative movement with respect provisionol an adjustable b'oringtool which .to said member 8 during operation oi the '15 is formed of few parts, is strong and durable boring tool."

in operation and in which the parts are so The stock A is preferably formed of a sinformed and arranged that the cutters can be .gle piece of metal compnslng the bar 2, and ad usted quickly, easily and accurately; the same is. provided with a vertically art one 'ecs n t vnt s 1 f u XL rtin tars e set r)- Oh b t a d ad a tage 0 this in ranged s ot lo e e ll 0 1 i v r y the e I 20 vention will be apparent from the following through. The upper wall 1'? of the slot is description taken in conjunction with the provided with an internal recess 18 which is accompanying drawings in which similar substantially centrally arranged and which characters of reference designate simila leads from the slot 16, as clearly shown in parts in the several views. Fig. l, and said recess 18 is alined with an 25 "In the drawings: aperture formed in the lower end 20 or the Figure l is a front. elevation of the borbar 2, said aperture being tapped to secure lng' tool of the. present invention, aportion an ad usting screw 22 for a purpose here thereof being shown in section; inafter to be described.

Fig. 2 is another view in elevation of the The slot 16 is adapted to receive a spacer 30 tool, certain parts also being shown in secelement 2%, an expander indicated generally tion, the view being taken on a, different 'at B and the sets of cutters C and'D in a manplane than that of Fig. 1; ner presently to be described.

' Fig. 3 is a sectionalview on the line 33 The upper set of cutters is indicated at C of Fig. 1; and the lower set of cutters is indicated at 35 I Fig. 4eisa-sectional view on the line4=4 D; the set C comprising the oppositely ex- 35 or Fig. 1; o v I tending cutters 32 and 3% respectively, vmich igl 5 is a sectional view on the line 55 maybe of any desired orpreierred shape, depending upon the cut-to be made while the i F 6 is asectional View on the line 66 lower set of cutters D comprises the oppo- I sitely extending cutters 36 and 38 respectiv'c- Fig. 7 is afrontview of theexpander used ly, which also may be of any desired or prewiththetool. a i ferred shape depending upon the cut to be 7 Referring, now more particularly to the made. The lower set of cutters are alined drawings, the stock or head ofthe tool is with the upper set of cutters, and each cut- 45 indicated generally at A, the same comprister is provided with an inner upwardly beving asubstantially cylindrical metallic bar elled edge 4:0 f01 adjusting purposes, as herev 2providied at itsjupper'end with a reduced inafter described. I ta'pered' stem 4 adapted tobe received in a i The lowercutters 86 and 38are arranged [socket 6 formedin' th'e endofaspindle, turinopposed relation, as shown inFig. 1, and

H 50. ret or other member 8 whichcarries the tool. are seated upon the lower wall 42 of the slot 16 and are arranged to project outwardly be yond the outer surface of the bar 2.

For retaining the cutters in their spaced relation, the spacer block 24 heretofore mentioned is preferably employed, the same being a single block of metal of elongated form and of such thickness as to nicely fit in the slot 16, and of such length as to rest upon the upper edge 46 of the opposed lower cutters D and to support the upper cutters C in sliding contact with the upper wall 17 of the slot 16.

For the purpose of providing a close and tight fitting association or assembly of the upper and lower sets of cutters and the spacer with the head A, set screws 52 are employed which extend through the lower end of the bar 2, and as will be apparent, said screws bear against the lower edges of the lower set of cutters D and may be adjusted to force the cutter D upwardly, thereby forcing the spacer 24 and the upper cutters C upwardly in contact with the upper wall 17 of the slot 16 whereby the cutters G and D and the spacer element are firmly united in assembled position.

The bar 2 is provided with a flattened portion or recess 54 opposite each cutter, said flattened portions having tapped apertures therein through which set screws 56 extend to bind against the cutters to retain the latter in any desired adjusted position.

The cutters C and D must of course be horizontally adjustable, and to effect this result, the expander B shown in Fig. 7 is employed, the same comprising 7 a cylindrical rod58 provided with a wedge element 60 at its lower end; said wedge element being 6 formed in any desired manner as by upsettingrhe end of the rod or by attaching a separate element thereto, the wedge element havingthe oppositely arranged bevelled faces 62. The spacer element 24 is provided with a central slot 64 extending therethrough and through which the rod 58 extends, said rod being of such length thatthe upper end thereof will project above the spacer element. When the rod is positioned in they slot 64, the wedge element 60 is arranged between the bevelled ends of the lower cutters D and is normally in contact therewith. The upper end of the rod 58, as before-mentioned, extendsabov'e the spacer element 24, and as shown in Fig. 1,

the upper end is reduced as at 66 to positien anupper wedge element 68. The upper wedge element is provided with oppositely arranged bevelled faces 70 and with arecess formed in its lower face into which the reduced end 66 of the rod 58 extends; the wedge element thus being supported by said rod 58, and the wedge element is further provided with a stem 72 which is arranged in the before-mentiened recess 18. The lower face of the \"vedgeelemerit 60 is presided with a recess into which the upper nd of the set shrew 22 extends.

The stock A is provided with an upper pilot arranged above the upper set C of the cutters, the pilot being indicated generally c at E and comprising the angle ring 74which is secured to the stock in such a manner that there is no relative movement between said ring and stock. It has been found satisfactory'to secure the-ring 74. to the stock by shrinking it'thereon, but this is merely by:

means maybe employed, but for illustrative purposes, the countersunk screws are f shown. By providing the pilot ring 7 6 as a' removable element, it will beapparent that pilot rings of varying sizes maybe employed to suit the particularfiob; that is, pilot rings of various diameters may be employed I with the tool. The block 2 above the upper set of cutters is provided with a transversely arranged aperture which receives a facing cutter 82 which is retained in desired position by a set screw 84. V

In certain instances, it is desirable to provide a lower pilot, and for this purpose, the

j lower wall 20'of the block 2 is reduced as shown at 86 and is externally threaded to secure the upper threaded end of a lower pilot 88 whichisprovided with a stem 90 having a recess 92 formed in the lower end thereof for positioning the tool on asuitable base during operation; It is believed that the construction of the boring tool just described will be apparent to those skilled in the art, but a brief resume of the assembling of the several parts and the operation thereof is deemed necessary.

In forming the tool of the present invention, more particularly assembling the sevthe like. The stock A with its angle ring 74 is then ready for the assembling of the various parts of the tool to effect a complete structure, and to that end the set screws 22 and 52 are retracted until thei'r'upper ends are arranged within thelower" wall 20. It is usual and easier in the assembling of the tool to reverse the position of the bar 2 and when this has been done, the upper wedge. element 68 ;1s' inserted through the slot 16',

until the stem 72 thereof is seated in the resees '18. The cutter ;element32 is then in-- sertd the slot 16, thesanie being 7 ported by the upper wall '17 ofthe slot 16, the cutter 32 being pushed inwardly until its hevsilea edge centacts. with the of the bet;

w The spacer element 24 with the rod 58 of the expander B arranged in the central aperture therein isthen placed in the slot 16 with the upper wallthereof resting upon the lower surface of the cutter 32. Because of the recess 18, it is apparent that the upper wedge element 68 ofthe expander will seat upon the upper wall 17 in other words,-the stem 72'thereof will enter the recess 18. This will permit the upper reduced end of the rod 58 tojbe alined with the recess 66 formed in the lower wall of the upper wedge element 68. and further, the upper end of the rod 58 is fpermittedtoaline itself with said recess be cause of the fact that when the wedge element seats on the upper wall 17 of the slot 16,- suflicient clearance is provided for the upper reduced end 66 to pass-the upper wedge element :68 whereby to aline itself with the recess in the upper wedge element, and the parts should be proportioned to permit this.

The cutter 34 may then be inserted between the upper wall17 of the recess and the spacer element, and then thecutters 36 and 38 may be inserted'between the lower wall of the -bar2 and the lower wall of the spacer ele- '-ment. The parts having been thus assembled, the set screws 52 may be adjusted to force the. cutters 36 and 38, and consequently the spacer .24: and the cutters 32 and 34 toward theupper wall 17 of the slot 16.. It is i position;

the facing cutter 82-is then adjusted and the 7 tool isready for use. In use the tool is held tool.

not necessary at this time to effect an extremely tight connection or arrangement of thefcutters in the bar for the reason that it is necessary to adjust the cutters horizontally toa predetermined position. The parts having-beenlassembled as described, the bar 2 may be reversed to its normal position whereuponthe upper wedge. element 68 will be engaged with the upperreduced end 66 of therod 58. i For adjusting the sets of cutters C and D, the set screw 22 may be actuated whereby the bevelled surfaces 62 and 70 of the lowerv and upper wedge elements respectivelyflvill'engage the inner bevelled ends of the severalcutters and force the same outwardly to a desired position. The position having been accurately ascertained and of fected, the "set screws 56ers then actuated to securethe cutters in their desired adjusted This having been accomplished,

'of the latter. As the tool is passed downwardly through this work F .the edges 94 of i the cutters 36 and 38 first cut through and formthe wall '96 and the tool then passes downwardly and the cutters 32 and 34fun'ction to finish the previously cut wall 96 in a well known manner, and when this has been done, thecutting edges 98 of the cutters '36 and 38 cut the" wall 100 and also form a valve seat 102 by reason of the angular cutting edge 104. After the cutters 32 and 34 have performed their work, the upper pilot E is positioned adjacent the wall 96 and preferably in contact therewith whereby to guide the tool during its operation. a

The expander, 'as before-mentioned, comprises a rod 58 having wedge elements at the opposite ends thereof. The wedge element 60 is shown in the drawings as integral with the rod 58 but this ismerely for illustrative purposes, as obviously the wedge element60 may be a separate element if desired which may be rigidly or otherwise secured to the rod 58. For convenience, however, it has been found highly satisfactory to rigidly secure the wedge element 60 to the lower end of the rod 58, as shown in said Fig. 7. The wedge element at the upper end of the rod isshown as detachably connected to the rod by merely seating upon a reduced portion at the end of said rod.

' It is apparent that this particular arrangement of'parts permits the utilization of vari ous sized upper wedge elements in accordance with the particular cut to be made and in aecordancewith the particular job to be done. For example, it is possible by this .ments may be worn away to such an extent that the wedge elements will not function to accomplish the necessary adjustment. In

this event, an elementcomprising the rod 58 permit an adjustment of the cutter elements to a greater degree than the previously used expander element. All in all, the present arrangement compris'esa tool in which the cutter elements may be adj usted relative to each other in various degrees, the adjustment-of said cutter elementsbeingacc'omplished by the foregoing description taken in conjunction with the accompanyingdrawings, but it is to be understood that the drawings are for illustrative purposes only and that various changes in the form and proportions of the device may be made within the scope of the appended claims without departing from the spirit of the invention.

What is claimed is: I

1 In a boring tool,.the combination of a metallic bar, spaced sets of cutters in said bar, a spacerfor retaining the sets of cutters in spaced relation, and an expander provided with spaced wedge elements mounted in the bar and guided by said spacer for vertical movement to adjust the cutters in unison.

2. In a boring tool, the combination of a metallic head provided with a vertically arranged slot extending transversely therethrough, sets of cutters arranged, in the slot adjacent the upper and lower walls thereof, a spacer positioned between said sets of cutters for retaining them in spaced relation, an

expander in the head positioned by said spacer and having wedge elements at the ends thereof normally engaged with the cutters, and means for adjusting the position of the expander to vary the position of the sets of cutters simultaneously.

3. In a boring tool, a head having a slot extending therethrough, a plurality of sets of cutters in said slot, a spacer for retaining the sets of cutters in spaced relation, each set of cutters having oppositely arranged cutting elements and said spacer having a vertical opening therethrough, an expander in said opening and guided thereby and including wedge elements at each end thereof normally in contact with the cutter elements, means for securingthe cutters and spacer element in assembled relation against displacement, and means for actuating the Wedge elements simultaneously to vary the positions of all of said cutters simultaneously and to relative predetermined amounts. 7

4. In a boring tool, in combination. a head, spaced sets of cutters arranged in said head, a spacer for retaining the sets of cutters in spaced relation, and an expander for simultaneously adjusting the sets of cutters horizontally to a relative predetermined amount.

,5. In a boring tool, in combination, a head, spaced sets of cutters arranged in said head, a spacer for retaining the sets of cutters in spaced relation, and an expander working through the spacer element to be positioned and guided, thereby for simultaneously ad- 'justing the sets of cutters horizontally to a relative predetermined amount.

connecting the wedge elementswhereby the latter may be simultaneously actuated, and means for actuating the Wedge elements whereby to horizontally adjust the sets of cutters simultaneously and to a predetermined degree. r

7. A boring tool comprising a cylindrical head having a vertical slot extending transversely therethrough, sets of cutters arranged adjacent the upper andlower walls of the slot, each set including oppositely arrangedcutter elements extending radially outward from the head, a spacer element in said slot for retaining the cutter elements in spa'cedrelation, adjustable means for securing the spacer'element and cutters against longitudinal movement in the slot, said spacerelement having an opening extending longitudinally thereof substantially midway of its side edges, an expander element guided in the spacer element opening and having an integral Wedge shaped lower end normally engaging one set of cut-'- longitudinally in the slot to simultaneously actuate the wedge elements whereby tovary the horizontal positionsof the sets of cutters simultaneously to relative predetermined amounts.

8. A boring tool comprising a cylindrical headhaving a vertical slot extending transversely therethrough, sets of cutters arranged adjacent the upper and lower walls of the slot, a spacer for retaining the sets of cutters in spaced relation, said spacer being provided with a longitudinal opening, an expander element mounted in the opening, wedge means carried by one end of the element and adapted to engage one set of cutters, a seco'ncLwedge means detachably carried by the other end of the element and adapted to engage the other set of cutters, and means for actuating the wedge means simultaneously whereby to simultaneously adjust the sets of cutters.

9. A boring tool comprising a head, spaced sets of cutters in the head, means for retaining the cutters in spaced relation, and means comprising simultaneously adjustable plural wedge elements for simultaneously adjusting the sets of cutters. r V

10. In a boring tool, the combination of a slotted bar, spaced sets of cutters at the ends of saidslot, a spacer separating said sets of slotted bar, spaced sets of cutters at the ends of said slot, a spacer separating said sets of cutters and an expander for said cutters mounted in said spacer, said expander comprising Wedge blocks engaging said sets of cutters and adjustable simultaneously in the same direction to adjust said sets of cutters.

12. In a boring tool, the combination of a y head having a slot extending therethrough,

' sets of cutters at the ends of said slot, a spacer separating said sets of cutters, an expander extending through said spacer, and adjusting meansmounted in said head and engaging an end of said expander, said expander comprising Wedge blocks engaging said sets of cutters and adjustable simultaneously in the same direction to adjust said cutters.

In Witness whereof Ihave hereunto set my hand. y a

' JOHN S. STEVENSON, JR. 

